#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

char c;
int sf,nrc=0,nrl=0,n,lit;
int main()
{
   while (!f.eof()){
      f>>noskipws>>c;
      if ( (c >= 'a' && c <= 'z') ||  ( c >='A' && c <= 'Z') ){
            nrl++;
            lit = 1;
      }
      else{
         if(lit==1){
            nrc++;
            lit=0;
         }
      }

   }
   g<<nrl/nrc;
}